Unsigned canvas floral painting with vase and apple.??

Pencil marks on back say: Oct bouquet then some other pencil marking that I cannot make out. Pen mark says artist - Fritzi. On the right in red marker says: Oct 1966 with #79 above it.

The third pic had a stamp mark that says: Wet rack 10 and some stuff I can't read and then 12x16.

Is that dried mold on the back? Where/when did the apple come into this? The back where the apple is painted looks somewhat cleaner.

I know I'm all over the place but my tables are full so I'm going for the walls. Thanks for looking and any knowledge/information and or opinions are always welcome here.

Happy weekend everybody.